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8 February, 10:47

Calculate how large a mass would be necessary to obtain a mechanical noise limit of [Equation] = 1 nG, 1 µG, and 1 mG if the mechanical resonance frequency is [Equation] = 100 Hz. If the mass is to be made of cube of 'silicon, what would its physical dimensions be?

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  1. 8 February, 13:30
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    Mechanical resonance frequency is the frequency of a system to react sharply when the frequency of oscillation is equal to its resonant frequency (natural frequency).

    The physical dimension of the silicon is 10kg

    Explanation:

    Using the formular, Force, F = 1/2π√k/m

    At resonance, spring constant, k = mw² (where w = 2πf), when spring constant, k = centripetal force (F = mw²r).

    Hence, F = 1/2π√mw²/m = f (f = frequency)

    ∴ f = F = mg, taking g = 9.8 m/s²

    100 Hz = 9.8 m/s² X m

    m = 100/9.8 = 10.2kg
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